Test

 Sound is produced due to the __________ of an object.

a) motion

b) vibration

c) reflection

d) refraction

Which of the following is necessary for the propagation of sound?

a) Vacuum

b) Medium

c) Light

d) Heat

Sound waves are __________ waves.

a) transverse

b) electromagnetic

c) longitudinal

d) surface

The unit of frequency is:

a) decibel

b) metre

c) hertz

d) second

The number of oscillations per second is called:

a) amplitude

b) wavelength

c) frequency

d) time period

The pitch of a sound depends upon its:

a) amplitude

b) frequency

c) speed

d) loudness

Which characteristic of sound depends on amplitude?

a) pitch

b) quality

c) loudness

d) frequency

The speed of sound is maximum in:

a) gases

b) liquids

c) solids

d) vacuum

Which of the following has the highest speed of sound?

a) Air

b) Water

c) Iron

d) Vacuum

Echo is caused due to:

a) refraction of sound

b) diffraction of sound

c) reflection of sound

d) absorption of sound

For hearing an echo, the minimum distance between the source and the reflector should be about:

a) 10 m

b) 17 m

c) 34 m

d) 50 m

The loudness of sound is measured in:

a) hertz

b) joule

c) decibel

d) metre

The relation between speed (v), wavelength (λ) and frequency (f) is:

a) v = f + λ

b) v = f / λ

c) v = f × λ

d) v = λ / f

The sound wave in air consists of:

a) crests and troughs

b) compressions and rarefactions

c) nodes and antinodes

d) rays and waves

Which of the following quantities does not change when sound travels from one medium to another?

a) speed

b) wavelength

c) frequency

d) amplitude

The time taken to complete one oscillation is called:

a) frequency

b) amplitude

c) time period

d) wavelength

Ultrasound has frequency:

a) less than 20 Hz

b) equal to 20 Hz

c) more than 20,000 Hz

d) equal to 1,000 Hz

SONAR is used to:

a) measure loudness

b) locate underwater objects

c) increase speed of sound

d) produce echo

The phenomenon of persistence of sound is known as:

a) reverberation

b) reflection

c) refraction

d) absorption

Which device is used to measure the intensity of sound?

a) barometer

b) thermometer

c) sound level meter

d) ammeter

✅ Answer Key

b) vibration

b) medium

c) longitudinal

c) hertz

c) frequency

b) frequency

c) loudness

c) solids

c) iron

c) reflection of sound

c) 34 m

c) decibel

c) v = f × λ

b) compressions and rarefactions

c) frequency

c) time period

c) more than 20,000 Hz

b) locate underwater objects

a) reverberation

c) sound level meter